Balancing system for internal combustion engines



y 33- I A. J. BOCZ 1,907,339

BALANCING SYSTEM FOR INTERNAL COMBUSTION ENGINES Filed Nov. 1,192

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I INVENTOR Patented May 2, 1933 UNITED STATES PATENT OFFICE ALEXANDER J. IBOCZ, 015 DETROIT, MICHIGAN Application filed November This invention relates to balancing means for internal combustion engines, the purpose being to provide a simple and eflicient means whereby the engine vibration is re- 5 duced.

In the usual internal combustion engine there are ordinarily harmonic and other unbalanced forces. In an engine, as the connecting rod is short, the piston has a greater 1 speed of movement at the outer dead center than at the inner dead center. This is due to the fact that when the piston is in its intermediate position the crank is not at an angle of ninety degrees to the axis of the 1 piston resulting to unbalanced forces in jerks.

It is to provide means to eliminate any unbalanced forces, that is, the purpose of my invention is to secure a comparatively simple and inexpensive means of long life and simple form.

These objects and the several novel features of my invention are hereinafter more fully described and claimed and one form of a balancing device embodying my inven tion is shown in the accompanying drawing in which Fig. 1 is an elevation showing the crank shaft of an engine and a form of my balancing device.

Fig. 2 is a section on line 2-2 of Fig. 1.

3 is a bottom view of the balancer.

In the drawing the crank case of the ordinary internal combustion engine is indicated at 1 and the crank shaft is indicated at 2 and 35 shown as having a crank 3 and 4 on opposite sides of the main bearing portion 5 as is usual in a four, six, eight or any number cylinder internal combustion engine. One form of my balancing device is shown directly below the main bearing of the crank comprising a hollow casting 6 which may be bolted, as by means of the bolts 7 shown in dotted line in Fig. 1. The method and means of supporting the device in the stationary position is not a material element of this invention.

This casting 6 carries on opposite side of the center line 2-2 in Fig. 1, a shaft or-pin 8 and 9. On the shaft 8 is mounted a weighted lever 10 having at one end the weight 11 and at the opposite end a portion extending 1, 1924. Serial No. 747,261.

from the shaft downwardly and forwardly, terminating in a portion 11a on which bears a sleeve 12. This sleeve is mounted on one arm of a lever 13 pivotally supported on the shaftor pin 9. This lever 13 has a weight 5 14 which is exactly similar to the weight 11 and is positioned the same distance from the center line between the two elements. The main casting 6 is provided at the lower end with a hollow or recessed portion 15 in which there is a slidable plunger 16 having a head 17 on which the portion 11a of the lever 10 bears. A spring 17a tends to move the plunger to its uppermost position shown in Figs. 1 and 2, with the weights in the lowermost position.

The sleeve 12 is supported on the arm 13 by means of a shaft 18 and the arm 13 is forked having a side arm 19 as shown in Figs. 2 and 3 and arranged to support the shaft 18. The sleeve 12 is positioned between the ends of the second inner arm of the lever 13. On this sleeve is mounted a roller 20 which rides on a cam 21. This cam is arranged with the two high points 22 and 23 and is secured to the crank by means of the bolts 24 and thus rotates with the said crankshaft.

This is the preferred form of construction of the cam for a four cylinder engine.

This cam is so mounted that when the piston is at the inner or at the outer end of its stroke, the weights are always in the farthest position from the crankshaft in a four cylinder combustion engine.

Upon the end stroke of the piston the crank turns and it approaches the position of ninety degrees to the piston axis the cam begins to raise the weights and thus the speed of the piston is increased as it reaches its outer po- 90 sition and produces jerks, which displace the center of the shaft in all direction and the inertia of the weights and spring are always opposing such jerks of the engine, which is caused by the speed difierence between the in- 95, ner and outer stroke of the piston, which is due to the driving effort of the gas explosion or expansion or any other forces.

Any shape or form of cam can be used and so mounted as to respond to the vibrating .forces, which are opposed by said cam to minimize or prevent such forces in any in ternal combustion engine.

. The invention is not limited to the form of 5 the cam or the manner of its mounting as long as the inertia of the weights and the yieldable means resist the unbalanced forces of any multi-cylinder internal combustion engine in the opposite direction of the said forces thereby neutralizing them.

I am aware that other devices were arranged to accom lish this but none of them were a success because the inertia of the weights were moved not only by the unbalanced forces of an internal combustion engine, but they were subject to be displaced by the vibration of the flexible means, which arts, how to control the natural vibration of any flexible means so the movement of the weight or weights always oppose the vibration forces in an internal combustion engine, are shown in Patent No. 1,756,898 and 1,886,246 and in applications Serial No. 129,37 8223,226

My invention is distinguished from such previous'apparatus in the use of the cam operating at the crankshaft speed, whereby simplicity of construction is secured with less liability of wear and less liable to become disarranged by a cam shape, which begins actuation of the weights and flexible means at the time when the piston speed tends to decrease or increase, thereby counterbalancing the un balanced force in an internal combustion engine.

Having thus briefly described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent 1s' Means for balancing the secondary vibrations in a reciprocating engine comprising a cam driven at engine speed and having two high spots, a pair of levers pivotally mounted in spaced relation to each other, each lever comprisinga free end and a weighted end, the free ends of said levers actuated by said cam and resilient means holding said free ends against said cam.

In testimony whereof I sign this specification.

ALEXANDER J. BOCZ. 

